I have been to Hong Kong many times, on food pilgrimages. Kowloon Park, OK, you're smack in the middle of the most accessible part of Tsim Sha Tsui, and near the MTR, which is great for getting around. Grabbing an Octopus card will be helpful.
You are going to a food paradise. I stayed near where you will be for my first few trips, then switched to Hong Kong side, Central. But that's one MTR stop from TST. Or you can ride the Star Ferry across the harbor, a thing you should probably do at least once. The Octopus card will work for this too (and 7-11 stores, and more). The drop-off location is much less convenient than it used to be, but I still like the ride. You will walk past a mall with a giant Apple store visible, and in that mall are at least two superb dim sum joints. An even better one is actually in the train station for the airport train, but that one is hard to get into unless you arrive right at opening, or a little before, and wait.
If you like soup noodles with shrimp wonton, it's hard to beat Mak an Kee, various locations, but the one I always go to is along Wellington Street, Central.
Roast goose is a must-try. A visit to Yung Kee (also Wellington St Central) is a nice chance to explore local dishes, but you could also just go and have some roast goose. Probably best to try to get above the ground floor; I think that will happen if you book in advance. The lore is that the goose gets better, the higher your floor, and I can confirm to some extent. Last time I was there, just before the pandemic, there was an up and coming goose place in Wan Chai, but I never tried it.
For upscale, the Chairman is awesome, if you can get in, and cheaper at lunch. I think it justifies its reputation. On the same tiny short street, there is a very worthwhile Ramen place, but I don't imagine you want Japanese food in such a short trip. Other extremely worthy upscale Cantonese restaurants: Fook Lam Moon, and Seventh Son. If you have a group, these are great places to order a whole suckling pig. Everything I've tried at these places is just mind-blowingly topnotch.
The best Sichuan food I ever had was at Deng G in Wan Chai. The chef is a master; everything was extraordinary.
In your local area, TST, I had some favorites, but they are gone or not good any more. I'm sure there are still tons of great restaurants in that area, but I'm not so up on them any more. openrice.com is the place to find restaurant info for Hong Kong.