I've had various periods over the year on dating websites and my experiences have become worse as I've got older (I'm now 53). Based on what's happened to me, my advice would be...
Don't bother with men who make zero effort right from the off. I get a lot of messages that just say, "Hi". When my profile has a bio that talks about my hobbies, character traits and what I'm looking for, I find this insulting.
If you have to suggest a date or if he asks to meet but you end up having to come up with all the arrangements, it's likely he will cancel or just not turn up. Definitely don't do all the travelling. If they're not prepared to meet somewhere half way then they aren't bothered.
Don't have any suggestive/bikini shots etc on your profile. I am not looking for hook ups etc, so I don't want to give out that vibe and I've never been sent a dick pic etc. If it means that some men are put off messaging me then I'm fine with that, because I don't want pervy comments and those are men I wouldn't want to be with anyway.
A lot of men on OLD - especially around my age - look like shrivelled up potatoes. They come with insane amounts of baggage or have achieved little in life, but still think they're God's gift to women. If you receive messages from men you aren't interested in, just delete them. Don't send any kind of "thanks but no thanks" because you risk them replying with personal insults and abuse, no matter how polite you were.
Make the first few dates in public places, don't involve alcohol and don't let the guy known where you live. Keep yourself safe, because there are a LOT of nutters out there.
I think that people start as they mean to go on. If someone can't be bothered to make a good impression right from the first message, then don't bother wasting your time on them. Ultimately it's a numbers game, so don't take rejection/silence personally and know your worth.