What are some ways you keep your imaan high?
Remembrance of Allah ﷻ and worship. This world is temporary and fleeting, try not to get attached and distracted by its enjoyments. Frequent the Masjids, keep good company and have a routine of daily acts of worship and athkar.
How do you deal with doubts?
If you have serious doubts there are many Imaams and Sheikhs who are qualified and available to discuss them with you and clear your doubts. We live in a time of fitnah and ideological warfare and this is sadly an existing problem that many religious figures in our community are now equipped to deal with.
I don’t even have any particular doubts in particular but i often get the thought how do I know islam is to be guaranteed true? I don’t understand Classical Arabic and Im no Hadith scholar so how could i even be 100 percent certain that Islam is to be true as i can only access a tiny slice of the pie unless I dedicate my life to be a student of knowledge.
You don't have to be extremely knowledgeable to have yaqeen. Remember, most people who historically followed the Prophets and were devout believers who were persecuted and died on their faith were the poor/peasants of society. Most of the noble and affluent people would reject the message and fight to keep the status quo. So belief is not about your education level/knowledge but your heart and ultimately guidance is from Allah ﷻ.
Allah ﷻ says in Surat Al-Hajj, verse 46:
أَفَلَمْ يَسِيرُوا۟ فِى ٱلْأَرْضِ فَتَكُونَ لَهُمْ قُلُوبٌ يَعْقِلُونَ بِهَآ أَوْ ءَاذَانٌ يَسْمَعُونَ بِهَاۖ فَإِنَّهَا لَا تَعْمَى ٱلْأَبْصَٰرُ وَلَٰكِن تَعْمَى ٱلْقُلُوبُ ٱلَّتِى فِى ٱلصُّدُورِ
English - Sahih International
So have they not traveled through the earth and have hearts by which to reason and ears by which to hear? For indeed, it is not eyes that are blinded, but blinded are the hearts which are within the breasts.
Faith is not received through pure logic and reasoning but having a receptive heart and being sincere. You mentioned elsewhere that you listen to a lot of debates and unsurprisingly you haven't experienced an increase in Imaan from it. Try to replace that with listening to beneficial reminders/lectures, tafsir, reflecting over verses of the Qur'an, etc. This is how you increase your Imaan and gain blessings and reward for the time you spend doing so.
Whats some of your undeniable proofs of islam that i can comfort my imaan and say this has to be from god as nobody could come up with this in 7th century Arabia.
I don't know if you are specifically asking for scientific proofs but the biggest proof is the existence of the universe, of life, of us (humans) and our conscious mind. Try to go to places where you can explore and appreciate nature and you will find yourself in awe of the miracle of creation, the beauty and complexity that exists all around you. It will take your breath away. From the soft, delicate petals, colourful and scented, to the thunder, raging fiercely and lighting up the night sky, this is all the work of Allah ﷻ.
When you read the Qur'an you will notice that Allah ﷻ will point towards His creation, instructing us to travel in the land, as a proof of His undeniable existence.
At-Tur 52:35-36
أَمْ خُلِقُوا۟ مِنْ غَيْرِ شَىْءٍ أَمْ هُمُ ٱلْخَٰلِقُونَ
أَمْ خَلَقُوا۟ ٱلسَّمَٰوَٰتِ وَٱلْأَرْضَۚ بَل لَّا يُوقِنُونَ
English - Sahih International
Or were they created by nothing, or were they the creators [of themselves]?
Or did they create the heavens and the earth? Rather, they are not certain.
I typed this out and later realised you asked for proofs for Islam specifically and not the existence of Allah ﷻ. Some proofs you can observe for yourself would be the consistency of the Qur'an, which was not written but revealed orally during the time of the Prophet ﷺ over a period of 23 years. There are no contradictions or inconsistencies. There are within it prophecies that came true (like Abu Lahb and his wife dying upon kufr and the victory of the Romans over the Persians after having suffered defeat).
Another would be the character of Prophet ﷺ who was known to be honest and trustworthy, even his enemies would concede this fact. He was not a liar or fabricator. He had exceptional character and lived by and embodied the Qur'an. There were no scandals/secrets being revealed after his death, he had many family members who all loved him and continued to praise him after his ﷺ passing. He was just as exemplary at home among his family as he was in public among the people. You see glimpses of this when you study the Seerah and see how he interacted with people and dealt with difficult situations that would make most people lose their patience. This is the character of a Prophet and not a liar or a madman.
You don't have to become a scholar to appreciate this, but take some time out to learn what you can because the more you learn the more your conviction will grow. You will come across more and more things that will amaze you and affirm your faith.
Lastly, make a lot of du'aa because guidance is from Allah ﷻ. The Prophet ﷺ used to regularly make this du'aa:
يَا مُقَلِّبَ الْقُلُوبِ ثَبِّتْ قَلْبِى عَلَى دِينِكَ
Oh turner of the hearts (Allah, the Most High), keep my heart firm on your religion.
Make this du'aa frequently, and express genuine gratitude for being guided because this is the greatest gift we were given. May Allah ﷻ keep us all firm and steadfast on His deen.