Which filter should I use to remove the high frequency component from this signal?

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I have a time-varing signal and I would like to figure out what is the best filter (low-pass, band-pass, high-pass) to apply in order to remove the high frequency component. I've plotted the signal vs time, and then applied fft and pwelch seperately on the signal. Here are the results:
It seems that the frequency domain doesn't give me much more information than time domain. Am I missing something here? Any hint/input would be greatly appreciated.

Accepted Answer

Ameer Hamza
Ameer Hamza on 4 May 2020
What about smoothdata(). Experiment with the filter types
x = rand(1,1000)+50;
y = smoothdata(x, 'gaussian', 20);

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