bepobalote has addressed the trace width problem, besides that, there's general a problem of the output stage design.
I basically admit, that it can be meaningful to build an inverter with a BJT output stage, e.g. if you found a box with residual 2N3055.
Functional inverter circuits (more or less) with 2N3055 output stage have been presented at edaboard. Darlington or three
transistor cascades have been used with these to achieve sufficient output current.
In the present circuit, all transistors are driven with 6 mA base current each. Or with CD4013 limit current capability, rather half
of this value. A 2N3055 can amplify 3 mA to 0.3 or 0.4 A collector current. So one respectively two MJE5742 (a darlington
with higher current gain) have to take the remaining output current.
All-in-all, 100 W may be possible.