I'm kind of in the same boat, I have a 12k personal photography account that I used to bot. My engagement is 300 likes at worst and 1k at best, I found content quality to be the biggest modifier in this in terms of engagement in the new algo era. Average hobbyist photography IS saturated, you have to be your own worst critic and go for mass appeal, verticals, crushed blacks, feet dangling on top of the space station, sunsets/blue hour, bewbs, etc. Or just be really good, so good that the masses can also recognize your work as good.
I know I'm not the #1 photographer in the world, yet, but I've seen a lot of photographers trying to grow their personal pages wondering why it's not working when they really overrate their own work. Or even if it's good, photography is subjective and mass appeal is a lot different than what critics would call good photography.
I have an eyem page where I post a lot more content, then only post the best engaged ones from there on my IG page.
It's a lot easier to grow a "hub" or a community page where you feature other's best work over growing an original personal account. With a hub you can claim a hashtag and ask people to tag you, do giveaways, ask people to tag their friends "who would have good content to feature" and generally be seen as an authority, stuff like that doesn't really work with a personal account.
Shoutouts don't really bring much results, but there you can test your content quality on a big page against all the other posts. If it gets above average engagement on that page, you might be on to something. If not, optimize your content first.