raising and training a one year old shiba inu after months of bed rest. where do i start?

i have a recently turned 1 yr old shiba inu that ive had since he was 3 months old. a month into rescuing him, i became chronically ill, lost my job, and was on bed rest from april 2025-august 2025. my boyfriend, who lives with me, had to work more hours to make ends meet. throughout these months, i was not able to take my puppy out, train, and socialize him as much as i would’ve liked, and i didn’t get to raise him the way i had planned. he just sat with me and chilled during my months long bed rest. with treatment, im finally able to leave the house on good days, so i’d like to know a few things.

1. is it too late to socialize him? how do i go about doing so? ive taken him to the local dog park and he loves to play with bigger dogs but he will often come off as “aggressive” because he shows teeth and barks a lot, but he doesnt mean harm. i’d love to take him places that allow pets, such as public parks, outdoor restaurants, malls, etc. but i have no idea how well he would do.

2. ive been training him a little more now that im able to stand and move around. when its just us two, he’s good at “sit”, “off”, “quiet” (sometimes), “come here”, and “break” (for food). however if you were to add another person/thing (even my boyfriend), or a difference in environment (like outdoors for example), its like he doesnt know anything. what can i do to really perfect these commands with any person/environment?

3. any recommendations of what i can do with him on my high inflammation days to keep him entertained? im open to anything that will keep him focused and stimulated. he likes to chase things and enjoys those puzzle feeder things however he has gotten bored with the ones we have at home and my boyfriend and i are still recovering financially.

4. i feed him about a cup of his homemade food i began to make for him, twice a day. i boil ground beef, white rice, and carrots together and add some water as well. is this enough? he always seems hungry to me and acts like it too but i cant tell if he actually is hungry or if he’s just bored. also is this a good mix of food? should i remove or add anything to it? (he has a slow feeder too)

5. we live in my moms home but separate.. if that makes sense. my mom has 4 cats, and sometimes my dog will be chill, but for the past 3 weeks, i havent been able to safely leave the house by myself so he’s been extra bored. this results in him wanted to chase the cats even more. any recommendations on how to navigate the dog/cat situation? is it possible to reintroduce them or separate them?

for puppy context, my dog has a lot of energy but can get bored EASILY. he definitely has selective hearing too. very playful, very kind, loves attention and pets. also very, VERY vocal. over 20lbs, most likely 25-30lbs.

i know this is a lot but if anyone has any advice/ answers, im all ears!