Hello everyone,
I'm new to the world of electronics, so forgive me if something is unprofessional. I'm trying my best.

I want to build a logic level converter that can amplify the input signal to outputsignal with a High Level of
3. 3V or 5V. The output signal I want to decide with a switch. The smallest high signal to be amplified is 2V to a gain of 3. 3V and 3V to a gain of 5V.
The frequency is 100kHz.

I've had some ideas with transistor circuits, but I'm stuck in the calculation, because I don't have a constant high level at the input and I don't know how to handle it.

Can someone help me?

 

Welcome to AAC!

I want to build a logic level converter that can amplify the input signal to outputsignal

If you're working with logic devices and want to convert from one voltage level to another (e.g. 3.3V to 5V), that's not usually called an amplifier.

What logic voltages are you working with? Do you require level translation in both directions?

This bi-directional logic level shifter from Sparkfun will work for a wide range of voltages, but it only works for 2 voltages:

For what it does, it's rather expensive. I've bought these from AliExpress, but had problems with my second purchase (packaged improperly).

 

For logic level conversion examine the specifications of the CD4009 IC, which was created for logic level conversion.
If your levels need adjusting then a comparator IC with an open collector output and an adjustable OC voltage will allow total freedom for voltage and threshold adjustment.