Tips to grow in alternative niche

Hi, i'm on instagram for almost 2 years with an account about travel and landscapes (15k).
In this moment i'm trying the method follow/unfollow for some day and then i'll analyze the results.
i receive 500 likes voluntarily per pic( one time was more preformance but i've no posted for weeks and (a part the update of instagram)i've lost a bit of engagment)..1000 likes in total in 3-4 days with my activity.
Now i put about 1200 likes per day in same niche.
Which tips to accelerate in growing for this my particular niche?
does it exist a free statistic tool to discover hour posting etc..?
thanx in advance

I'm in this niche & I'll tell you it can be tough to grow. I've been at 20K for about a month despite my best efforts to get more. Engagement is good, so I'm happy about that - about 2000 likes per post.

Follow / unfollow seems to be the most reliably, albeit slow way to grow. Just make sure your following active users from influencer accounts with good engagement. Follow people who have commented within the past 30 minutes to get the best follow back rate.

Post more often. Not sure how many you're posting, but 4 a day seems to be my optimal number.

I don't worry so much about what time to post - I usually post my first picture around 5am - when that one hits 800 or so likes, I get ready to post the next one, etc, etc.

Some people will suggest engagement groups - they may help a little, but they won't help a lot in this niche. Frankly, it just isn't viral.

is it more helpful liking people comments or people in the follower list (ever from a big page)?