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LTspice does have their own way of deriving bode plots automatically from transient simulations, they call it the FRA. It's not as nice as PSS with Cadence Spectre, but is better than manually stepping excitation frequency.

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As others have already said, you need a scope with an averaging acquisition mode. AFAIK most basic scopes made in the last ten years should have this.

Also when using averaging mode it is imperative that you have a good trigger source for the scope. Do not try and trigger from waveforms coming from the SMPS itself. If you signal generator has a trigger output, use that. If not, use the signal generator's output routed to another scope channel.

Knowing the model numbers of your scope and signal generator would help us give more specific advice.