To play the devils advocate :
Maybe if you have been ‘picked’ to join a time traveller he/she/they have to wipe your memories once you are back or ’ arrive ’ how will they know you don’t spill the beans to the monitors or people in general. So what criteria do you think watchers of time travel would be looking for, how will they know that a person won’t use it for evil? Personal gain is almost a given for most people otherwise why do it if you are happy with your lot .
There is no guarantee if you go back that you won’t end up in the ’ funny farm’ People generally are not that tolerant of personal account’s of time travel with no backup proof or the,I can’t tell you that piece of information line ( or I’ll have to kill you) a bit of antipsychotic’s under a compulsory treatment order or a few lightening bolts would be most likely inflicted upon the poor genuine time traveller without an escape route. Locked up as legally insane in the past wasn’t a good look. ( one flew over the cuckoos nest a reminder of that )
I’m just panning it out, you need to blend in and say nothing to anyone and remember your lines at all times. No getting drunk and blurting it out in the wrong company . Plus no using present information for personal avarice, you will possibly find the time cops hot on your trail and be busted back to the mideval ages speaking a dialect no one understands, or worse the Salem witch hunts- not nice! They will be monitoring changes in history time lines and sudden wealth and technology leaps- causes ripples in the time continuum.
Be careful for what you wish for!