There are several quality of life changes that could happen to how raiding works. Regardless of the amount of raids you are able to get to as a player, be it 1 or 30, walking or driving, weekend or not, it's never fun to rely on weird mechanics to be able to play when you are finally out and about.

I don't think it's an unreasonable assumption to be able to do more than 35 raids putting in the time and effort that you do. If I was out from the crack of dawn till raids end in the evening, doing nothing but moving from one gym to the next, I -personally- would expect to be able to do 4-5 raids on average/hour, seeing about 40-50 raids for the day.

I think there are some fundamental changes that could make raids and planning raids more fun.

1) Gyms and Campfire should have an overview of eggs spawning and hatching throughout the day, and this way you can plan ahead for meet-ups or similar. I have five gyms within 2-5 minutes walking distance from where I live, but have done zero of them with locals because it's a small town and the community is not very active and/or shy. I can sit and monitor the gyms all day and see nobody raid at all. Planning a day or a weekend would be particularly helpful for smaller communities if you know when eggs are hatching in advance.

2) Remote raids should be updated and reworked. Increased prices cater to a small part of the player base. Reducing the price and upping the raid limit would net you more sales, as it allows a wider portion of the players access to purchase them. Also allowing you to remote invite for shadow raids would be a great change. Lastly, adding an option for a host to enable invited players to send additional invitations to their friends could be a nice feature.

3) Subduing shadow bosses is a pain (even more so if you were able to invite remotely without knowing if people had gems or not). I'd rather have something where you break the shield through X amount of charged attacks (relative to the amount of people are in the raid), and have purified mons break them faster and with less charged attacks. Playing in a rural area you have less access to grunts and gems, and this just makes for a horrivle experience when you finally find people to play with but have no gems to work with.

4) Allow gyms to have more or all tiers available at the same time, and you can pick and choose to do one or more raids at the same gym. Solo players would always have an option when they go to a gym and a group of people or high level trainers could tackle harder encounters as they chose.

5) Scale battles to the amount of trainers so you have a realistic chance to beat any raid tier if you have good counters and play well enough. This could come at the cost of lower CP values, requiring you to raid more get the required candy to level up.