This is a decision that is entirely up to you based on what you think is best for your body, what side effects you can or are willing to tolerate, and what you learn by reading and researching.
We can't tell you what to do here. But I can share my personal experience, which is below. And again, what you decide to do in this situation is entirely up to you. Owning our responsibility in what we do to help our health, even if it's swallowing a pill prescribed to us by a doctor, is a big part of our health.
Anyway, what worked for me is increasing methylfolate in increments, per Freddd's protocol, until my side effects abated to where they were livable and I could coexist with them for an indefinite time. It's a subtle distinction between sides you can live with and discomfort, but the distinction does exist.
Worth noting is I crashed several times while reaching this "stable" high level of methylfolate, and then I crashed a couple more times while maintaining it. But the crashes didn't necessarily mean an increase in daily sides...my crashes were always more like purges or detox and my sides woudl usually get a bit better afterwards. Crashes usually lasted a week or so, but they never felt "malignant", if that makes sense. It was like I had a bad flu but not something that worried me. If I let the crash run its course, it went away.
Also worth noting is I was on much higher doses of methylcobalamin than you are. For the whole first year I was on Freddd's protocol, I injected about 5mg of methylcobalamin per day. In my experience, taking a really high dose of methylfolate requires a very high dose of methylcobalamin to go with it. Other's mileage may vary.
Also had to stop and start LCF and adenosylcobalamin a few times. These are both very potent supplements and can provoke a myriad of symptoms like anxiety, insomnia, etc.
Listening to your body and stopping something for a while if necessary, then maybe circling back around to it with a modified approach, is important. Pushign through or ignoring potentially dangerous symptoms like heart palps or dizziness shouldn't be done. Ever. Stopping and trying to figure out what the problem is and if it can be fixed is crucial.
Pushing through an extremely runny nose, minor muscle aches, a bit of a fever, or even anxiety or short-term insomnia is more of a personal choice. Although personally, I won't push through much insomnia. If it affects my sleep even for just a couple nights I stop it for a while and modify my approach to it very quickly.
@Johnmac might be able to chime in with his experience, as well. He has recently had success with Freddd's protocol after struggling with the low & slow approach for a while.
HTH a little. Good luck!