Depending on how frequently it needs to be connected and how much tension it needs to hold, it might be worth taking a look at some Wago connectors, as i’ve generally been impressed by how well they hold. Not really an option if the connection needs to be regularly connected and disconnected, but if it’s just occasional it could be an option.
Outside of that I would second Aubeynarf’s suggestion, but don’t have much personal experience with them.
Depending on how frequently it needs to be connected and how much tension it needs to hold, it might be worth taking a look at some Wago connectors, as i’ve generally been impressed by how well they hold. Not really an option if the connection needs to be regularly connected and disconnected, but if it’s just occasional it could be an option.
Outside of that I would second Aubeynarf’s suggestion, but don’t have much personal experience with them.