I'm a freelance climber with very little work so probably an example you can learn something from. This is how to have 26 days off a month.
I started by doing any day I could get, regardless of how little it paid. Had a pad of money from a previous job and was living at home so rolled any profit back into kit. I did however have fairly hard rules from the beginning on what I wouldn't do. Hedge topping because it's miserable and reductions/topping because I didn't want to get into any fannyish arguments about too much/not enough off etc. So that narrowed the field quite a lot. Firms hiring freelancers just want to hear, "Yes, mate. No problem." I shut a lot of doors or had them shut on me by refusing to prune. As time went on, I became pickier still and started saying removals only. Couldn't even be arsed with deadwooding.
I also started quite actively discriminating against employers whose ethics don't jive with mine. I don't do dolescum work and I don't help people who do. Council, state schools, quangos like the canals, the various trusts etc. Anything with a whiff of taxpayer and the answer's no. It started with not doing individual jobs and turned into just refusing to deal with people who did any public sector work, me involved or not.
The thing that probably lost me the most work was when I decided climbers' wages were a piss take and I was going to be the change I wanted to see. I started increasing my rate fairly agressively, usually about double the rate of inflation plus whatever I fancied. I crawled to the top of normal dayrates and then came on cam and kept going. At time of writing, I price to walk away from any day with £380 after day-costs (mainly van fuel). That usually means a day rate starting at £420. The most I've charged is £620. I now only get either big stuff for proper firms or gypsies/landscapers that aren't capable of hiring anyone cheaper because the cheaper guys don't have the gear I do. Nothing in the middle doing normal sized work. That's all looked after by people happy do whatever for whoever for £150-250.
I hasten to add I'm good, well equipped and extremely reliable. I'm not the guy with a climbing kit and 200 and a red bull for breakfast, probably slightly late to the yard. I'm the guy who's at site, before you, with everything. But there are only so many people who need that and will pay for it.
So that's how to not fill your diary. Be picky and price yourself like you don't want to work (which I don't).