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Just tuned the values of the parameters of Mastodon according the post by Nora Codes.
There is a rule here:

(MAX_THREADS x WEB_CONCURRENCY ( CPU cores x 1.5 )) + (STREAMING_CLUSTER_NUM ( CPU cores – 1) x DB_POOL) + (sidekiq equals to DB_POOL) < max_connections
The VPS hosting howdee #Mastodon instance has a 4-Core CPU, 8G RAM. The values of the above parameters are:

• MAX_THREADS = 5 # default value
• WEB_CONCURRENCY = 6 # 4 x 1.5
• STREAMINGCLUSTERNUM = 3 # default value, 4 -1
• DB_POOL = sidekiq = 25 # default value
• max_connections = 200 # manual adjustment

Don't know how the changes will effect the Mastodon performance, since there's only 1 user...