How does one know or find out when it is a good time to consolidate transactions?

I've heard others say they can control their cost by having an option or something?

I've been using Exodus wallet and it is a flat fee no matter what -- with no options or control.

Just looking to do one of 2 things, figure out when the best times to consolidate are (via a program or app)?? or get a new wallet of some kind that gives you those options.

Any help or direction in either scenario would be greatly appreciated.

Pecker!